Pe Eee ost ‘semi-mature. eae tes 0.8385; 4 Pea Npx»o 1.4408; sap. v. 
4.21; after acet. 14.96; sol. p. + 2.5°. 
‘For the oil from young leaves: diso 0.8390; &py — 6.039 Npwo 1.4440; acid v. 0.4; 
Bap. v. 1.83; after acet. 1.68; sol. p. 0°. 
The principal constituents of the oil are methyl-n-nonylketone, terpenes and about 
1.5 per cent. of phenols. cone can be gathered from the report as to the proof of 
q the Ketone. 
Oil of Xanthoxylum piperitum, see page 41. 
Oil of Yamakosho leaves. From the leaves of the Formosan Yamakosho plant 
_Y. Shinosaki*) obtained 1.2 per cent. of a brownish-yellow oil of camphory smell. 
 diso 0.9049; a, — 18.89; Npzoo 1 4635; sap. v. after acet. 48.66; insoluble in 70 per cent. 
alcohol. 90 per cent. of the oil boil from 160 to 190°, 6 per cent. between 190 and 
> 205°. It contains about 33 per cent. of hydrocarbons and about 49 per cent. of cineole 
_ (resorcinol method). 
Nothing is known as regards the botanical origin of the Yamakosho leaves. 
Oil of Ylang-Ylang. Of this oil about 20000 kilos were exported from Réunion a 
4 in 1914, which is a little more than the year before. The prices varied between 
q fr. 50.— and fr. 60.— as against £ 6.— in the preceding year’). : 
On page 109 of our Report October 1913 we discussed a paper by Jahrling on the 
classification of ylang oils according to their constants and we came to the conclusion 
that it would not be advisable to accept Jahrling’s outside values for the various 
qualities (extra, I@, 15, Il), as in our experience they are not to be relied upon in 
judging best oils of commerce. We said at the time that the evaluation of ylang oils 
cation and we can only repeat this statement in view of a paper by H. D. Gibbs °) 
hich may be looked upon as a continuation of Jahrling’s theories and in which the 
same standpoint is taken up. Gibbs has examined quite a number of ylang oils 
_ originating in part from the factory of Santos & Jahrling and has collected the analytical 
results in two tables. Here again classification took place exclusively according to 
the constants, more especially the ester value, a measure which, after our own 
_ observations, we are simply unable to accept. The following properties were found 
in the various qualties examined: — 
Quality go eae ae A200 Npz0 - Ester v. 
0.9478 —6.7° 1.4762 148.2 
Extra = to to to to 
4g 0.9612 == 2h" 1.4900 201.7 
z : M0202" =) 16.759 1.4835... 122.0 
‘ ]a 15 to £0." ee = to to 
0.9472 — 45.95° 1.4965 143.0 
: | 0.9349 — 32,2° 1.4935 112.7 
Jb 2 ~ and and | and and 
Ee fy ira O28 £6 = 46 1.4975 115.2 
Ret2 1 O21 — 51.4° 1.5040 61.3 
ee *) J. Chem. Ind. Tokyo 18 (1915), 1081; Journ. Soc. Chem. Industry 34 (1915), 1270. — *) Chem. Ztg. 40 
pei9i6), 18. — 4) Philippine Journ. of Sc. 10 (1915), A, 99. 
was not by any means such a simple matter as it would appear from Jahrling’s publi- — 
